Protected Cultivation and Greenhouse Design
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Questions and Answers

What is a primary objective of protected cultivation?

  • Minimize pest control efforts
  • Reduce the need for water
  • Obtain high value products (correct)
  • Increase labor costs
  • Which of the following is NOT an example of a method used for crop protection in greenhouses?

  • Pesticide spraying (correct)
  • Floating covers
  • Irrigation
  • Windbreaks
  • Which greenhouse orientation is recommended for maximizing sunlight exposure?

  • North-South (correct)
  • East-West
  • South
  • North
  • Which of the following is a disadvantage associated with greenhouses?

    <p>High initial cost</p> Signup and view all the answers

    Which material can be used to create windbreaks around a greenhouse?

    <p>Trees</p> Signup and view all the answers

    What type of greenhouse is most appropriate for maximum radiation energy absorption in cloudy areas?

    <p>Spherical dome</p> Signup and view all the answers

    Which type of greenhouse is primarily used in cold areas?

    <p>Paraboloid hyperbolic</p> Signup and view all the answers

    What is the typical slope angle range for the walls of a mansard roof greenhouse?

    <p>60-70 degrees</p> Signup and view all the answers

    Which type of greenhouse is best suited for uneven terrain?

    <p>Uneven span</p> Signup and view all the answers

    What structural form characterizes a greenhouse with a roof steeper than the upper roof?

    <p>Mansard roof</p> Signup and view all the answers

    Study Notes

    Protected Cultivation

    • Aims to produce high-value products.
    • Involves growing crops in controlled environments, like greenhouses.
    • Addresses unfavorable conditions such as low solar radiation, water/nutrient levels, and weeds.

    Greenhouse Design

    • Orientation:

      • North-South recommended for optimal sunlight.
      • East-West orientation is suitable for locations above 30º North or South latitude.
    • Greenhouse Structures:

      • Gothic Arch: Semi-circular shape.
      • Quonset: Curved structure.
      • Mansard Roof: Walls slope at 60-70° angles.
      • Lean-to: Cost-effective, built adjacent to a building.
      • Gable Even Span: Most common, suitable for all crops.
      • Uneven Span: One side of the roof is longer than the other.
      • Ridge and Furrow: Prone to wind and snow issues.
      • Paraboloid Hyperbolic: Suitable for cold areas.
    • Location Factors:

      • Proximity to markets, roads, and water sources.
      • Windbreaks are essential, preferably located on the north and west sides.
      • Distance from buildings: Windbreaks should be 100-200 feet away from structures.
    • Foundation Considerations:

      • Built on a concrete slab, using materials like cement and wood.
      • Porous concrete in flooring allows water drainage.
      • Wood requires treatment to prevent corrosion.
    • Types of Soilless Growing Systems:

      • Hydroponics: Growing plants without soil, known for higher productivity and reduced water usage.
      • Sand Culture: Similar to hydroponics, but uses sand as a medium.
    • Greenhouse Cover Materials:

      • Glass: Offers high light transmittance and durability.
      • Fiberglass: Affordable and durable, often chosen for greenhouse covers.
    • Greenhouse Layout:

      • Connected Greenhouses: Require more heat than separate greenhouses.
      • Separate Greenhouses: Easier to expand or contract production.
      • Oval Layout: Reduces dimensional issues compared to rectangular layouts.

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    Related Documents

    Greenhouse Construction Q&A PDF

    Description

    This quiz covers the principles of protected cultivation aimed at producing high-value crops in controlled environments like greenhouses. It also explores various greenhouse designs, their orientations, and key structural features to optimize crop growth under different conditions.

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